Pulleys 2 and 4 are of equal diameter, as are pulleys 5 and 6. Link 1 is connected by turning pairs A and B to pulleys 2 and 6. Flexible link 8 runs over pulleys 2 and 6 and is rigidly secured at points E and F to the base. Link 3 is connected by turning pairs C and D to flexible links 8 and 7. Flexible link 7 runs over pulleys 4 and 5. When link 1 has straight translational motion, pulleys 2 and 6 roll along flexible link 8 and pulleys 4 and 5 rotate about axes B and A, imparting complex motion to link 3.
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